In this image from video posted on Facebook, courtesy of the George W. Bush Presidential Center, former President George W. Bush participates in the ice bucket challenge with the help of his wife, Laura Bush, in Kennebunkport, Maine.(THE ASSOCIATED PRESS)

Alberta NDP leader Brian Mason, dumps ice water on Alberta Premier Dave Hancock as part of the ALS ice bucket challenge after Hancock provided an update on the government's response to recommendations in the Auditor General's Special Duty Report on the Expenses of the Office of Premier Redford and Alberta's Air Transportation Services Program, in Edmonton.(JASON FRANSON/THE CANADIAN PRESS)

Tennessee Titans players take part in the ALS Ice Bucket Challenge and pour ice water over their heads after NFL football practice Wednesday, Aug. 20, 2014, in Nashville, Tenn.(Mark Humphrey/AP)

Major League Baseball Executive Vice President of Baseball Operations Joe Torre participates in the ALS Ice-Bucket Challenge outside the organization's headquarters in New York.(Vanessa A. Alvarez/AP)

Dale Earnhardt Jr. smiles while taking the ice bucket challenge after practice for the NASCAR Sprint Cup Series auto race at Michigan International Speedway in Brooklyn, Michigan.(Bob Brodbeck/AP)

SoftBank Corp. Chief Executive Masayoshi Son dumps a bucket of ice water onto himself as he takes part in the ALS ice bucket challenge at the company headquarters in Tokyo August 20, 2014.(Toru Hanai/REUTERS)

Photo provided by the Archdiocese of Cincinnati, Jim Rigg, right, superintendent of the diocese's 113 schools, and Elder High School Principal Tom Otten take the ice-bucket challenge at Elder High School in Cincinnati.

Photo released by NBC shows host Jimmy Fallon, left, dumping a bucket of ice water over the head of actress Lindsay Lohan as she participates in the ALS Ice Bucket Challenge on "The Tonight Show Starring Jimmy Fallon," in New York.

In this image released by Central Michigan University, Central Michigan University President George Ross is doused by student government president Chuck Mahone as he takes the ALS Ice Bucket Challenge

Photo shows a man dressed as Bumble Bee, a character from the Transformers movies takes the "Ice Bucket Challenge" to raise awareness for the disease ALS in Beijing, China.